" Hi all
The low quality can be accepted if balanced by low costs, but when it involve our safety it is very very important extensive controls on every product.
Non only Lithium batteries are involved in fire risks, luckily at today we (me and my friends) don't have experienced fire on batteries, but we had on controllers.
We have some pictures of "made in USA" burned controller
I have no doubt about good quality of this controller. But It had many years of use (about 7) without too much care.
I want to say that talking about electric vehicles there are risks even with products of good quality.
Imagine how much risk using products of poor quality.
One of my friend have 3 Quantya Freeride and Strada, he purchased used some year ago (I think are 2009/2010 models).
He use it for rent in his farm near Milano and have no time to maintenance it so the bikes are often abandoned as they are after the use in the Woods.
All his motorcycles have had problems with the batteries, but only involved the BMS, not the battery cells.
The main cause of the malfunction is the minimum current consumption of the BMS.
Leaving the battery discharged for several weeks, the minimum comsuntion of the BMS discharged some cells lower to 2.4/2.5 Volts.
Fortunately the cells do not ruin and just recharge them with a small battery charger and everything returns to normal operation.
Also the BMS (Made in Swizzerland) went dead on 2 batteries, but all cells are saved.
I repaired it with the new BMS16 purchased at Chargery.com
With a little interface that I built the BMS16 can control the HiperFets on the original Quantya power card.
This are some picture of my modifications.
Attachment 7293Attachment 7294Attachment 7295
My balancer is of the passive type and absorbs about 1A with a control on the voltage +-1mV.
Hope these info are useful to someone.